error expected initialized before bool

I got this error in the following program for line 22, and I do not know how to fix it.

Code:

// Brett Balzer
// Converting to binary
// 11/01/06

#include <iostream>

using namespace std;

struct stack
{
   int count;
   struct node *top; 
};

struct node
{
   int data;
   struct node *next;
};

bool pushStack (struct stack *stack, int data)
bool popStack (struct stack *stack, int &data)

int main()
{
    int number;
    int digit;
    struct stack theStack;
    struct stack *stack; 
    stack = &theStack;

    cout << "Enter a decimal number" << endl;
    cin >> number;
   
    while (number > 0)
    {
      digit = number % 2;
      number = number/2;
      pushOK = pushStack (stack, digit);

      if (pushOK == false)
      {
        cout << "Stack overflow creating digit" << endl;
        return 0;
      }
      
     }
        
    while (stack->top != NULL)
    {
      popStack (stack, digit);
      cout << digit;
    }

return 0; 
}

  bool pushStack (struct stack *stack, int data)
  {
    bool success;

    struct node *newptr;
    newptr = new struct node;
    newptr->data = data;
    newptr->next = stack->top;
    stack->top = newptr;
    stack->count = stack->count + 1;
    success = true;
    return success;
  } 

  bool popStack (struct stack *stack, int &data)
  {
    bool success;

    struct node *dltPtr;
   
    if (stack->top == NULL)
    {
      success = false;
    }
    else
    {
      dltPtr = stack->top;
      data = stack->top->data;
      stack->top = stack->top->next;
      stack->count = stack->count - 1;
      free (dltPtr);
      success = true;
     }
   }

thank you very much!

add ; after function declaration